31994000280 has 384 divisors, whose sum is σ = 115482931200. Its totient is φ = 7617408000.

The previous prime is 31994000279. The next prime is 31994000303. The reversal of 31994000280 is 8200049913.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 66793081 + ... + 66793559.

It is an arithmetic number, because the mean of its divisors is an integer number (300736800).

Almost surely, 2^31994000280 is an apocalyptic number.

31994000280 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31994000280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57741465600).

31994000280 is an abundant number, since it is smaller than the sum of its proper divisors (83488930920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31994000280 is a wasteful number, since it uses less digits than its factorization.

31994000280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 31994000280 in words is "thirty-one billion, nine hundred ninety-four million, two hundred eighty", and thus it is an aban number.